OREANDA-NEWS. Companhia Siderurgica Nacional (CSN) (BM&FBOVESPA: CSNA3) (NYSE: SID) announces its consolidated results for the first quarter of 2013 which are presented in Brazilian Reais and in accordance with International Financial Reporting Standards (IFRS) issued by the International Accounting Standards Board (IASB), and with Brazilian accounting practices, which are fully convergent with international accounting norms, issued by the Accounting Pronouncements Committee (CPC) and approved by the Brazilian Securities and Exchange Commission (CVM), pursuant to CVM Instruction 485 of September 1, 2010.